/*
 * Copyright 2012 Evgeny Dolganov (evgenij.dolganov@gmail.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gf.core.deploy;

import java.util.Comparator;

import com.gf.annotation.Order;

public class OrderComparator implements Comparator<Object>{

	public int compare(Object a, Object b) {
		int aOrder = Order.DEFAULT_ORDER;
		int bOrder = Order.DEFAULT_ORDER;
		
		//by annotation
		Order aOrderAnn = a.getClass().getAnnotation(Order.class);
		Order bOrderAnn = b.getClass().getAnnotation(Order.class);
		if(aOrderAnn != null){
			aOrder = aOrderAnn.value();
		}
		if(bOrderAnn != null){
			bOrder = bOrderAnn.value();
		}
		
		return (aOrder<bOrder ? -1 : (aOrder==bOrder ? 0 : 1));
	}

}
